Fuel injection device for internal combustion engines



May 24, 1932. i w. TOBLER 1,860,063

FUEL INJECTION DEVICE FOR INTERNAL COMBUSTION ENGINES Filed May 28, 1951 Inn ENTER:-

zJ'M J44. BM (FM, QM MM fn-rm RN ism/s Patented May 24, 1932- UNITED STATES PATENT OFFICE WERNER TOIBLER, OF WINTERTH'UR, SWITZERLAND, ASSIGNOR TO THE FIRM 0F SULZER FREE-ES SOGIETE ANONYME, 0F WINTER'IHUR, SWITZERLAIHD' FUEL INJECTION DEVICE FOR INTERNAL COMBUSTION GENES Application filed Kay 28, 1931, Serial No. 540,567, and in Switzerland September 25, 1930.

This invention relates to fuel injection devices for internal combustion engines.

In a fuel injection device according to this invention the fuel is delivered'to the working chamber through a delivery pipe passing through the cylinder head and connected at its inner end as by screwing to an injection nozzle and this nozzle makes a liquid tight joint with the inner end of a jacket or wall surrounding the fuel delivery pipe so as to provide a clearance between the pipe and the jacket, whereby any fuel that may leak through the joint betweenthe nozzle and the injection pipe can escape through the clearance space. Thus any fuel that may leak in this manner is prevented from escaping unnoticed, as for example by passing into 'cooling medium surrounding the nozzle, and is discharged in such a manner that it can be readily noticed and the leak rectified.

A construction according to the invention is illustrated by way of example in the accompanying drawings, in which Figure 1 is a section on the lineII of Fi'ure 2, and

igure2 is a plan.

In the construction illustrated the cylinder head a of an internal combustion engine carries a valve casing e through which passes a'delivery pipe 0 screwed at its lower end to a nozzle (Z having injection openings -0 for atomizing the fuel as this enters the combustion space I). The delivery pipe 0 is surrounded by a jacket 7 so that an annular clearance space is provided between the pipe and jacket, the lower end of which makes a tight joint with the nozzle d when the jacket. 7 is screwed down by means of the bolts 9 so as to press the nozzle (1 on its seating it carried by the valve casing e. In order to protect the nozzle '03 from overheatin it is surrounded by an annular coolin c amber 11 through which cooling water is circulated from an inlet pipe I, through conduits is formed in the jacket 7 and an outlet m. The nozzle seating h is formed in a screw cap the delivery pipe 0 and the nozzle d can escape through theclearance space to the outlet n at the upper end of the valve casing where it can be observed, and that fuel leaking in thismanner cannot pass into the coolin water and thus escape unnoticed.

imilarly if the joint between the nozzle (2 and the jacket 7 leaks, water will pass up through the clearance space to the outlet 71. where it can be observed.

I claim:

1. In a fuel injection device for internal combustion engines the combination with a fuel delivery p pe connected at its inner end to an injection nozzle. of awall making a liquid tight joint with the nozzle and surrounding the delivery pipe with a clearance space between the pipe and wall, and of a connection between the clearance space and the room outside the fuel. injection device,

whereby any fuel leaking through the joint between the nozzle and the delivery pipe may escape.

2. In a fuel injection device for internal combustion engines the combination with a fuel delivery pipe connectedat its inner end by screwing to-an injection nozzle, of a sleeve making a liquid tiglht joint with the nozzle and surrounding t e delivery pipe with a clearance space between the pipe and sleeve,-

said clearance space opening to the room outside the fuel injection device, whereby any fuel leaking through the joint between the nozzle and'the delivery pipe may escape. v

In testimony whereof I have aflixed my signature.

WERNER TOBLER.

which can be removed for the purpose of gaining access to the cooling chamber i.

It will be seen that any. fuel'which may leak throughthescrewth'readed joint between 

